No - if you are houseproud, and like clean floors and walls and would object to water, drool and mud everywhere.
No - if you have very little space in your house or garden to accommodate such a huge dog.
No - if you would find it difficult to deal with a giant dog within your living space.
No - if you do not have the time or inclination to groom a huge double layer coat regularly and keep on top of knots and tangles.
No - if you dislike considerable amounts of exercise, ideally in the country, near or in water.
No - if you have toddlers and small children who can be flattened easily by an exuberant Newfoundland.
No - if you cannot afford the considerable expense of veterinary bills, food, dog training and running a large car.
No - if your family all work full time and will not be available to care for your dog for long periods during the day.
No - if you are not willing to devote time to proper training to ensure your young headstrong Newfoundland is not a delinquent.